Boiler.



W. A. N ISUN BOILER. APPLICATION FILED AUG. 5, 1908.

Patented Oct. 5, 1909. 2 SHEETS-SHEET 1.

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W. A. NISUN.

BOILER.

APPLICATION FILED AUG. 5, 1908.

Patented Oct. 5 1909.

2 SHEETS-SHEET 2.

mm co PHOTO-UWIDERAPHERS. WASHINGTON m a UNITED STATES PATENT OFFICE.

WALTER A. NISUN, OF MINNEAPOLIS, MTNNESOTA.

BOILER.

To all whom it may concern.-

Be it known that I, TALTER A. NISUN, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements in Boilers;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention has for its especial object to provide an improved hotwater or steam heating boiler equipped with a gas or oil burner; and tothis end it consists of the novel devices and combinations of deviceshereinafter described and defined in the claim.

The improved boiler is illustrated in the accompanying drawings, whereinlike characters indicate like parts throughout the several views.

Referring to the drawings, Figure l is a view partly in side elevationand partly in section, some parts being broken away, showing theimproved boiler. Fig. 2 is a plan view of the parts shown in Fig. 1; andFig. 3 is a plan view of the boiler with all parts above the horizontalline marked 00 m removed.

The improved boiler is preferably round in cross section, although itmay be square or of other angular form. The body 1 of the boiler properis rigidly but detachably secured to a base shell 2 which has a hingeddoor 3 and serves as the primary combustion chamber. As shown, thedetachable connection between the said parts 1 and 2 is made by shortnutted bolts at passed through projecting lugs 5, of said parts. A pipe6 for the supply of the gas or oil extends into the combustion chamber 2and is provided with a burner 7 and a valve 8, both located within saidcombustion chamber. Upright flues 9 extend vertically through the boilerbody 1 and their open ends are cast into the top and bottom plates orheads of the said boiler body.

A dome 10, the cross section of which corresponds to that of the bodysection 1, is located directly over the latter but spaced aparttherefrom to form the secondary combustion chamber 11. The bottom plateof the dome 10 is centrally connected to the top plate of the boilerbody 1, by a short water circulating pipe 12. The secondary combus-Specification of Letters Patent.

Application filed August 5, 1908.

Patented Oct. 5, 1909.

Serial No. 447,079.

tion chamber 11, at its sides, is inclosed by a semi-cylindrical flange13 and by quadrants 14, which latter are connected to the former byhinges 15 and are normally secured, at their free ends, by a .screw 16.The flange section 13 is provided with internal lugs 17 ever this may befound necessary or desirable. As shown, several cold water return pipes19 open into the bottom portion of the boiler body 1, and a hot water orsteam outlet pipe 20 leads upward from the central portion of the dome10.

The numeral 21 indicates a pressure gage which is connected to the topof the dome l0, and the numeral 22 indicates a pipe which extends fromthe top of the dome and to which an ordinary safety valve (not shown)will in practice usually be attached.

The numeral 23 indicates a water gage which is connected to the boilerbody 1.

The numeral 24 indicates a damper applied in the door 3 and by means ofwhich the amount of air supplied to the combustion chamber may beregulated.

The flame from the burner 7, as is evident, will first strike againstthe bottom of the boiler section 1, and from thence will pass upwardthrough the flues 9 into the, secondary combustion chamber 11, where thesaid flame will be brought into direct contact both with the bottom ofthe dome 10 and with the top of the said boiler section 1. This, as isevident, gives a large amount of surface and contact both with the flameand with the water. The products of combustion are drawn off from thesecondary combustion chamber 11 through a pipe or flue 25, which, asshown, extends outward through the flange 13 and thence upward. When theboiler is used to generate steam the water will be maintained in theboiler body 1, some little distance below the top thereof, so that thesteam generated will escape into the dome 10, where it will besuper-heated by the action of the flame in the secondary combustionchamber 11. When the boiler is used as a hot water heater the dome 10,as well as the boiler body 1, will, of course, be filled with water; andin this case the hot water which passes upward into said dome will beheated to stillhigher temperature by the action of the flame in the saidsecondary combustion chamber 11.

One of the principal features of this invention consists in the boilerbody having integrally cast sides and head or flue sheets and havingflues, the ends of which are cast into the said head or flue sheets inthe process of construction of said boiler body. This not only givescheap construction but gives highly efficient, strong and durableconstruction, in which the flues will not become loose in their seats.Preferably the said fiues 9, in a boiler designed for heating purposes,would be of rolled steel; but for some other purposes, such, forinstance, as for automobile use, the fiues would usually be of copper.

In some cases the boiler might be provided with a grate adapting thesame to burn coke or coal.

In actual practice the eflieiency of the boiler above described has beendemonstrated.

hat I claim is:

In a boiler, the combination with a cylindrical primary combustionchamber, of a cylindrical boiler body resting on and extending upwardfrom said primary combustion chamber, a cylindrical dome extendingupward from said boiler body but spaced apart therefrom to form asecondary combustion chamber, a multiplicity of fiues located withinsaid boiler body and all extending from said primary combustion chamberto said secondary combustion chamber, a centrally located Waterconnection between said boiler body and dome and water circulatingpipes, one extended axially upward from said dome and the other openinginto the lower portion of said boiler body, substantially as described.

In testimony whereof I afiiX my signature in presence of two witnesses.

WALTER A. NISUN.

WVitnesses:

HARRY D. KILeoRE, F. D. MERCHANT.

